Add trailing dash to CROSS_COMPILE and remove ARM_TOOLS

Now,
	CROSS_COMPILE = arm-linux-gnueabi-
If the desired compiler isn't available in the user paths,
please the full path:
	CROSS_COMPILE = /usr/bin/arm-linux-gnueabi-

Signed-off-by: Parav Nagarsheth <parav.nagarsheth@gmail.com>